Question

Which one of the followings has same number of molecules as present in 11g of CO2? A) 4g of O2 C) 4g of o B) 4.5 g of H20 D) 1/4 moles of NaCl
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Answer 1

Answer:

A, C and D

Explanation:

Molar mass of CO₂ is 44g/mol, so 11g of CO₂ contains 0.25mol

4g of O₂ is 4/32 = 0.125mol

4g of O is 4/16 = 0.25mol

4.5g of H₂O is 4.5/18 = 0.25mol

1/4mol of NaCl is 0.25mol

So, A, C and D are correct.

Answer 2

Answer:

Explanation: As we know, Molar mass of Co2 is 44 a.m.u . Given mass is 11g . To get no. of molecules, we divide 11 with 44 .                                       1-  11/44=0.25 molecules of CO2.                                                                                     2-  4g of O2, hence it's molar mass is 32 , so , 4/32=0.125                                          3-  4g of O , hence it's molar mass is 16  , so , 4/16=0.25                                        4-  1/4 moles of NaCl  =   o.25 molecules .                                                           It's means only the second one's is odd , furthermore , all the options have the same no. of molecules .                                                                                    THANKS FOR YOUR PRECIOUS TIME .